Arthur C. Clarke's 2001 Newspad

"At several points during the film, we see ill-fated astronauts David Bowman and Frank Poole using a flat, iPad-like device. Those who read Arthur C. Clarke's novelization of the movie will remember that he described this device as the "Newspad," something that was used by people of the future (as envisioned in 1968) to watch TV and read newspapers. You can read the full description of the device after the break -- it's described as a newsreader, with two-digit codes for each article online, and a constant stream of information from the hourly updates on "electronic papers.""